When my 690 blew the headgasket last spring we had to stop at a random house and fill the radiators with water. The bike was burning water in a low performance water injection kind of way...bike still ran well amazingly. But when the water was running out the temperature gauge was pegged and it will start to flash as well as a warning light comes on. The bike ran fine right to that point but I was into service and shutting it off as fast as possible. I have not torn into the bike since to fix it other than to dump the remaining liquid out.
My intuition nearly makes up for my lack of good judgement.
Just installed my new trolling motor